28748905 has 4 divisors (see below), whose sum is σ = 34498692. Its totient is φ = 22999120.

The previous prime is 28748903. The next prime is 28748911. The reversal of 28748905 is 50984782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18386944 + 10361961 = 4288^2 + 3219^2 .

It is not a de Polignac number, because 28748905 - 2¹ = 28748903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28748903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2874886 + ... + 2874895.

It is an arithmetic number, because the mean of its divisors is an integer number (8624673).

Almost surely, 2^28748905 is an apocalyptic number.

It is an amenable number.

28748905 is a deficient number, since it is larger than the sum of its proper divisors (5749787).

28748905 is an equidigital number, since it uses as much as digits as its factorization.

28748905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5749786.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 28748905 is about 5361.8005371330. The cubic root of 28748905 is about 306.3423944462.

The spelling of 28748905 in words is "twenty-eight million, seven hundred forty-eight thousand, nine hundred five".